Description
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: fix tp_meter counter underflow during shutdown
batadv_tp_sender_shutdown() unconditionally decrements the "sending" atomic counter. If multiple paths (e.g. timeout, user cancel, and normal finish) call this function, the counter can underflow to -1.
Since the sender logic treats any non-zero value as "still sending", a negative value causes the sender kthread to loop indefinitely. This leads to a use-after-free when the interface is removed while the zombie thread is still active.
Fix this by using atomic_xchg() to ensure the counter only transitions from 1 to 0 once.
[sven: added missing change in batadv_tp_send]
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < e75e2ab463b5b34df6b98f94d740aff327ce9f6b; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < abae88fa254f2981d39ac003a7b302528a22af64; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < c66d20a3ff095e3f000551d208ec2606616db15c; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < c1bac194733aabd731aafa6a01350c229e187dba; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 01cefc5923889e29dbb5f281c3d457714ceb9c00; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 90ae3eae06b7b8ab9f6250b9497c860915b4c17b; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < aeae11c5dad9cd0d50723890bdd866f8e6db2e7d; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 94f3b133168d1c49895e7cc6afbcf1cc0b354602 |
| Linux | Linux | 4.8 |
References
- https://git.kernel.org/stable/c/01cefc5923889e29dbb5f281c3d457714ceb9c00Patch
- https://git.kernel.org/stable/c/90ae3eae06b7b8ab9f6250b9497c860915b4c17bPatch
- https://git.kernel.org/stable/c/94f3b133168d1c49895e7cc6afbcf1cc0b354602Patch
- https://git.kernel.org/stable/c/abae88fa254f2981d39ac003a7b302528a22af64Patch
- https://git.kernel.org/stable/c/aeae11c5dad9cd0d50723890bdd866f8e6db2e7dPatch
- https://git.kernel.org/stable/c/c1bac194733aabd731aafa6a01350c229e187dbaPatch
- https://git.kernel.org/stable/c/c66d20a3ff095e3f000551d208ec2606616db15cPatch
- https://git.kernel.org/stable/c/e75e2ab463b5b34df6b98f94d740aff327ce9f6bPatch
Timeline
- Published
- Jun 24, 2026
- Last modified
- Jul 8, 2026
- NVD status
- Analyzed